Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

22. The Respiratory System

Introduction to Lung Physiology

Anatomy & Physiology

22. The Respiratory System

Introduction to Lung Physiology

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Multiple Choice

What causes air to flow into our lungs when we breathe in?

Contraction of the diaphragm and intercostal muscles

Relaxation of the diaphragm and intercostal muscles

Increase in atmospheric pressure

Decrease in lung volume

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Verified step by step guidance

Understand the basic mechanics of breathing: Breathing involves the movement of air into and out of the lungs, which is driven by pressure differences between the atmosphere and the lungs.

Identify the role of the diaphragm and intercostal muscles: The diaphragm is a dome-shaped muscle that separates the thoracic cavity from the abdominal cavity. The intercostal muscles are located between the ribs.

Explain the process of inhalation: During inhalation, the diaphragm contracts and moves downward, while the intercostal muscles contract to lift the rib cage. This increases the volume of the thoracic cavity.

Relate volume changes to pressure changes: According to Boyle's Law, an increase in the volume of the thoracic cavity leads to a decrease in the pressure inside the lungs (intrapulmonary pressure) compared to atmospheric pressure.

Conclude how air flows into the lungs: As the intrapulmonary pressure decreases below atmospheric pressure, air flows into the lungs to equalize the pressure difference, resulting in inhalation.